# -*- coding: utf-8 -*-

def dummy():
    """    
    @returns: 
    @rtype: None
    """
    return object


class Node():
    """"""


class NodePtr():
    """"""


class Doc():
    """"""


class DocPtr():
    """"""


class NsPtr():
    """"""


class Char():
    """"""


class TextWriter():
    """"""


class TextReader():
    """"""
